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College

He played running back at the College of William and Mary where he was a teammate of future Pittsburgh Steelers' head coach, Mike Tomlin. Williams finished his playing career at William and Mary with 1,220 rushing yards and 15 rushing touchdowns, while he totaled 131 receptions for 1,331 yards with 7 scores. As a senior, he led the team in receptions (57) and receiving yards (598).

Coaching career

Williams was a football assistant coach from 1992-95 for Norview High School, where he also coached track and field. He returned to William & Mary as a coach in 1996, coaching running backs from 1996–97 and defensive backs from 1998-2000.

Williams got his first NFL coaching experience coaching under Tony Dungy in the Tampa Bay Buccaneers organization in 2001. The next year, Williams followed Tony Dungy to the Indianapolis Colts where he served as the defensive backs coach for the Colts from 2002 to 2011.

On January 19, 2012, he was hired to be the defensive coordinator of the Minnesota Vikings.

On January 24, 2014, Williams joined the Detroit Lions defensive coaching staff as the new secondary coach.